Samson MPL 1204 Owner's Manual page 14

Connecting The MPL 1204 - General Suggestions
• NEVER connect a microphone and line level input to the same channel
simultaneously—use one or the other. You can have some channels
connected to microphones and others to line level signals (for example, you
might want to plug mics into channels 1 - 4 and line level signals into the
remaining channels)—just don't have both kinds of inputs connected to the
same channel.
• There are two "hidden" (or at least not so obvious) stereo inputs to the
MPL 1204; these are the Auxiliary returns. Use these whenever you want
to bring in stereo signals that will not need to be equalized.
• Channel and bus insert cables (sometimes called "Y-cords") should
terminate in standard 1/4" TRS jacks (ring to send and tip to return), wired
as follows:
TIP (RETURN)
RING (SEND)
• The MPL 1204 Aux return jacks are unbalanced stereo inputs, with the tip
carrying the left input signal and the ring carrying the right input signal
(with the sleeve carrying common ground), as shown below. Insertion of
a monophonic 1/4" jack into an Aux return will result in the incoming signal
being automatically routed to the left input only (and therefore panned hard
left).
TIP (LEFT SIGNAL)
RING (RIGHT SIGNAL)
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SLEEVE (GROUND)
SLEEVE (COMMON GROUND)